Samsung C100 Service Manual Trouble Shooting
4. SG H-C100 Flow Chart of Troubleshooting
1. Power ON
'POWER ON' does not work
Check the current
consumption more than
100mA
Yes
Check the Voltage of the
Battery more than 3.3V
Yes
Check the capacitor C236
close by U200(MSD) is
more than 3.2V
Yes
No
Download again
No
Charge the Battery
No
Check to the path from CN402 to
capacitor C236 close by U200(MSD)
2.7V≤ C234 of
U200(MSD)
= 2.8V
Yes
Check the TP222 of
U200(MSD) is high≒2.8V
Yes
Check the initial operation
END
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No
Check the MSD(U200)
No
Check the CX805-31P(U300)
4-1
SGH-C100 Flow Chart of Troubleshooting
2. Initial
Initial Failure
Check the R209 of
U200 is 'High'
Yes
No
Check the U200(MSD)
Check the clock
signal's wave at
R201(19.5MHz)
Yes
Check the TP234
3.9MHz wave & TP220
is "High"
Yes
Check the connections and initialization
using Factory Test Program
No
Check the clock generation circuit
(related to U200 and OSC200)
No
Check the U200(MSD)
END
4-2
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3. Charging
* Test after connecting with Battery
: All 4 terminals in battery should be connected to the phone by using jump-wires.
Abnormal charging part
SGH-C100 Flow Chart of Troubleshooting
Check the pin 17
of CN402 is around
5V
Yes
Check the pin 6 of
U210 is "LOW"
Yes
Check the pin 3 of
U210 is "LOW"
Yes
END
No
Check the TA
No
Check the U210
No Check the pin
3 of U503 is
short to ground
Yes
Check the connections of
4 terminals in battery
4-3
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SGH-C100 Flow Chart of Troubleshooting
4-4
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4. Sim
SGH-C100 Flow Chart of Troubleshooting
* Test with Sim
Phone can't access SIM card
Yes
Check the the voltage
at pin 1 & 5 of
CN500 is 2.8V ?
Yes
Check the CN500's
Connection to SIM
card
Yes
Check the circuit around U301
(MEMORY) and data stored in it
Yes
No
No
Check the circuit related to
CN500
Resolder CN500
END
4-5
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SGH-C100 Flow Chart of Troubleshooting
4-6
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